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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ContextCleanupListener.html 926 2014-09-17 03:05:56Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.servlet;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.sql.Driver;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.sql.DriverManager;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Enumeration;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import javax.servlet.ServletContextEvent;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.slf4j.Logger;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.slf4j.LoggerFactory;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.springframework.web.util.IntrospectorCleanupListener;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>/**<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Clears references that can cause container memory leaks on Web container class unloading.<a name="line.21"></a>
<span class="sourceLineNo">022</span> *<a name="line.22"></a>
<span class="sourceLineNo">023</span> * @see &lt;a href="http://opensource.atlassian.com/confluence/spring/pages/viewpage.action?pageId=2669"&gt;Spring Wiki Discussion of<a name="line.23"></a>
<span class="sourceLineNo">024</span> *      ClassLoader Memory Leaks&lt;/a&gt;<a name="line.24"></a>
<span class="sourceLineNo">025</span> * @see &lt;a href="http://bugs.mysql.com/bug.php?id=65909"&gt;MySQL Bug #65909&lt;/a&gt;<a name="line.25"></a>
<span class="sourceLineNo">026</span> * @since 1.0.49<a name="line.26"></a>
<span class="sourceLineNo">027</span> */<a name="line.27"></a>
<span class="sourceLineNo">028</span>public class ContextCleanupListener extends IntrospectorCleanupListener {<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    protected final Logger log = LoggerFactory.getLogger(getClass());<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>    /**<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * Unregisters any JDBC drivers registered under the current class loader after<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * first invoking the superclass version of this method.<a name="line.34"></a>
<span class="sourceLineNo">035</span>     */<a name="line.35"></a>
<span class="sourceLineNo">036</span>    @Override<a name="line.36"></a>
<span class="sourceLineNo">037</span>    public void contextDestroyed(ServletContextEvent event) {<a name="line.37"></a>
<span class="sourceLineNo">038</span>        try {<a name="line.38"></a>
<span class="sourceLineNo">039</span>            super.contextDestroyed(event);<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>            // Get my class loader<a name="line.41"></a>
<span class="sourceLineNo">042</span>            final ClassLoader thisClassLoader = this.getClass().getClassLoader();<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>            // Work around MySQL bug http://bugs.mysql.com/bug.php?id=65909<a name="line.44"></a>
<span class="sourceLineNo">045</span>            try {<a name="line.45"></a>
<span class="sourceLineNo">046</span>                Class.forName("com.mysql.jdbc.AbandonedConnectionCleanupThread", false,<a name="line.46"></a>
<span class="sourceLineNo">047</span>                  thisClassLoader).getMethod("shutdown").invoke(null);<a name="line.47"></a>
<span class="sourceLineNo">048</span>            } catch (Exception e) {<a name="line.48"></a>
<span class="sourceLineNo">049</span>                // ignore<a name="line.49"></a>
<span class="sourceLineNo">050</span>            }<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>            // Unregister JDBC drivers<a name="line.52"></a>
<span class="sourceLineNo">053</span>            for (Enumeration&lt;Driver&gt; e = DriverManager.getDrivers(); e.hasMoreElements(); ) {<a name="line.53"></a>
<span class="sourceLineNo">054</span>                final Driver driver = e.nextElement();<a name="line.54"></a>
<span class="sourceLineNo">055</span>                if (driver.getClass().getClassLoader() == thisClassLoader)<a name="line.55"></a>
<span class="sourceLineNo">056</span>                    DriverManager.deregisterDriver(driver);<a name="line.56"></a>
<span class="sourceLineNo">057</span>            }<a name="line.57"></a>
<span class="sourceLineNo">058</span>        } catch (Throwable e) {<a name="line.58"></a>
<span class="sourceLineNo">059</span>            log.error("exception cleaning up servlet context", e);<a name="line.59"></a>
<span class="sourceLineNo">060</span>        }<a name="line.60"></a>
<span class="sourceLineNo">061</span>    }<a name="line.61"></a>
<span class="sourceLineNo">062</span>}<a name="line.62"></a>




























































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